Installing A Common Vent System; About The Common Vent System - Navien NPE-180A2 Installation Manual

5. Installing a Common Vent System

5.1 About the Common Vent
System
The Navien Common Vent System* provides an easy
way to install the vent system for up to 12 Navien
NPE water heater units. By sharing the main intake
and exhaust vent pipes, effective system venting is
available with less venting materials and minimal
number of penetrations on the walls or roofing.
* Independently tested and approved by CSA
Read all safety messages and carefully follow the
guidelines in this manual when installing a common
vent system for the Navien NPE water heater units.
DANGER
Category IV appliances require a special
venting system. The vent system will operate
with a positive pressure in the pipe. Exhaust
gases must be piped directly outdoors using
the vent materials and rules outlined in these
instructions. Do not connect vent connectors
serving appliances vented by natural draft
into any portion of mechanical draft systems
operating under positive pressure. Follow the
venting instructions carefully. Failure to do
so will result in substantial property damage,
severe personal injury, or death.
64 Installing a Common Vent System
WARNING
Improper venting of the water heater units
●
can result in excessive levels of carbon
monoxide, which can lead to severe personal
injury or death. This water heater must be
vented in accordance with the "Venting of
Equipment" section of the latest edition
of the ANSI Z223.1/NFPA 54 Natural Fuel
Gas Code in the USA and/or the "Venting
systems and air supply for water heaters"
section of the latest version of the CAN/CGA
B149.1 Natural Gas and Propane Installation
Code in Canada, as well as all applicable
local building codes and regulations. Follow
all instructions and guidelines when venting
the water heater units. Venting should be
performed only by a licensed professional.
The venting system must be sealed gastight to
●
prevent flue gas spillage and carbon monoxide
emissions, which will result in severe personal
injury or death.
The building owner is responsible for keeping
●
the exhaust and intake terminations free of
snow, ice, or other potential blockages, as well
as scheduling routine maintenance. Blocked
or obstructed vent piping terminations could
result in property damage, severe personal
injury, or death.